It's not advised to configure a DNS cluster with cPanel DNS-Only if the servers in the cluster belong to separate individuals or companies due to the nature of how zones are shared. There's an open feature request for this at:

I read the ownership link in detail but it is unclear to me, and as I am currently setting it up a follow up question to the above scenario. I try to be as clear as possible. If you would setup as following, with 2 webservers and 2 dns only servers:

If you would add the 2 dnsonly servers in the cluster on each of the web serversweb1
web1.bla.com -> synchronise changes -> dns1.bla.com
web1.bla.com -> synchronise changes -> dns2.bla.com

And you would add
web1.bla.com -> standalone on dns1.bla.com
web2.bla.com -> standalone on dns1.bla.com

If I would change somedomainonweb1.com hosted on web1.bla.com, would it apear in the dns settings on web2.bla.com ? Is there a need to add web1/web2 on any of the dns1/2 servers in their respective cluster settings at all? If you do not add them web1 will send all records to dns1/2 even though it is not mentioned in the cluster settings on dns1/2.

If I would change somedomainonweb1.com hosted on web1.bla.com, would it apear in the dns settings on web2.bla.com ? Is there a need to add web1/web2 on any of the dns1/2 servers in their respective cluster settings at all? If you do not add them web1 will send all records to dns1/2 even though it is not mentioned in the cluster settings on dns1/2.

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Both hosting servers will show the zones from both servers listed under "Edit A DNS Zone" in WHM if you connect both servers to the same DNS cluster. DNS clusters are not designed for sharing between separate hosting companies, which is what the feature request seeks to address.